When to plant spinach in Green Bay
Spinach is cold-hardy, so every date keys off Green Bay's frost dates of May 4.
Step 1 · Sow
Direct sow outdoors
Apr 10 – May 1
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 20 – May 30
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Jul 26 – Aug 9
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Sep 11 – Sep 21
Maturity window for the second sowing.
Window
Days to maturity
40 – 50 d
Green Bay's 152-day season leaves this much room.
Spinach on Green Bay's growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
MAY 4
OCT 5
Common questions
When can I sow spinach outdoors in Green Bay?
Direct-sow around early April (Apr 10–May 1) in Green Bay, based on its local frost dates. Confidence 85%.
When will spinach be ready to harvest in Green Bay?
Expect to harvest from around mid May (May 20–May 30) in Green Bay, based on its local frost dates. Confidence 79%.
Can I plant spinach in autumn in Green Bay?
Yes — Green Bay supports a second, autumn sowing of spinach around late July (Jul 26–Aug 9), timed to mature before the first fall frost.
How long is the growing season in Green Bay?
Green Bay has roughly 152 frost-free days, which is enough time to grow spinach to maturity outdoors.
The rule of thumb
Sow spinach as soon as the soil is workable — it tolerates cool weather and light frost. Every date on this page is derived from that rule and Green Bay's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.